Southern mahogany is a native Australian hardwood popularly used for indoor and outdoor applications as well as furniture and cabinetry.
Other Names: Bangalay (NSW), Gippsland Mahogany (Vic), Woollybutt, Swamp Mahogany or Mahogany Gum.
Southern mahogany is a large, fast-growing species indigenous to coastal south eastern Australia, from Bairnsdale in Victoria to north of Newcastle in NSW. It is closely related to Sydney blue gum and is valued for its rapid growth, tolerance of frost and striking red wood.
An excellent timber tree, it has deep pink to red-brown heartwood with distinctively paler sapwood. The timber is hard, strong and dense with a medium, even texture and interlocking grain. It is durable and lyctid borers rarely attack the sapwood.
Southern mahogany seasons readily. It turns, machines, and glues well but can blunt knives and saws more quickly than other eucalypts. It is prone to severe growth stresses when young and should be quarter sawn to reduce damage. It can be difficult to dry and air-drying in protected stacks can reduce its susceptibility to end splitting and collapse.
The timber is used in cabinetry, furniture, flooring, decking, and veneer applications as well as general construction, poles and firewood. Historically it was used in heavy construction for sleepers and posts.
|Very Low||Low||Medium||High||Very High|
|Unit Movement:||0.37 %|
|Very High||High||Reasonably High||Medium High||Medium||Reasonably Low||Low||Very Low|
|Very High||High||Reasonably High||Medium||Low||Very Low|
|White, yellow, pale straw to light brown||Pink to pink brown||Light to dark red||Brown, chocolate, mottled or streaky|
|Modulus of Rupture - Unseasoned:||84|
|Modulus of Rupture - Seasoned:||130|
|Modulus of Elasticity - Unseasoned:||15|
|Modulus of Elasticity - Seasoned:||18|
|Maximum Crushing Strength - Unseasoned:||46|
|Maximum Crushing Strength - Seasoned:||77|
|Impact - Unseasoned:||18|
|Impact - Seasoned:||18|
|Toughness - Unseasoned:||Medium - 15 - 25 Nm|
|Toughness - Seasoned:||Medium - 15 - 25 Nm|
|Hardness - Unseasoned:||7.0|
|Hardness - Seasoned:||9.0|
|(0 - 5 yrs)||(5 - 15 yrs)||(15 - 25 yrs)||(more than 25 yrs)|
|(0 - 7 yrs)||(7 - 15 yrs)||(15 - 40 yrs)||(More than 40 yrs)|
|(0 - 20 yrs, usually < 5)||(21 - 40 yrs)||(41 - 64 yrs)||(More than 60 yrs)|
|Marine Borer Resistance:|
|Lyctid Borer Susceptibility:||Not Susceptible|
|EFH Spread-of-Flame Index:|
|EFH Smoke-Developed Index:|
|1 - non-combustible||2 - reasonably non-combustible||3 - slightly combustible||4 - combustible|
|Fire Properties Group
|Group Number - Other:||3 if used on MDF or particleboard ≥12mm; veneer thickness 0.6-0.85mm|
|Average Specific Extinction Area:||<250|
|Bushfire Resistance:||BAL 12.5 and 19 – All AS3959 required applications|
|Botanical Name:||Eucalyptus botryoides|
|Preferred Common Name:||Mahogany, Southern|
|Other Names:||Bangalay (NSW), Gippsland Mahogany (Vic), Woollybutt, Swamp Mahogany or Mahogany Gum.|
Southern mahogany features deep pink to red-brown heartwood with a distinctively paler sapwood. The timber is hard, strong and dense with a medium, even texture and interlocking grain.
The timber is used in cabinetry, furniture, flooring, decking and veneer applications, as well as general construction, poles and firewood.
Southern mahogany seasons readily. It turns, machines and glues well but can blunt knives and saws more quickly than other eucalypts. It is prone to severe growth stresses when young and should be quarter sawn to reduce damage. It can be difficult to dry.
Southern mahogany is relatively common on the south coast of NSW.
Whether for structural or finished flooring applications, timber offers durability, versatility and adaptability. The warmth, strength and natural beauty of timber flooring has proved enduringly popular in a wide variety of interior settings.
Timber poles are utilised in structural construction to provide support for gravity loads and resistance against lateral forces. Not only serving a structural function, timber poles provide many aesthetic benefits, with their use in construction often complementing architectural designs aimed at harmonisation with the natural environment.
For buildings that require large spans and column free interiors, timber portal frames provide one of the most aesthetically pleasing solutions. Utilising modern engineering technology, portal frame design transforms timber into a highly effective, efficient and economical structural product. This application guide provides a comprehensive overview of the process of using timber in the specification, fabrication and erection of portal frame structures.
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